In ancient China, Chuan and Jing Jing invent a cart that sails on land in order to quickly reach the warlord with an important message from the emperor.
The warlord\'s presence is requested at the emperor\'s banquet in two weeks, but he is sixteen days away by horseback. Using their math skills, ingenuity, and the wind, Chuan and Jing Jing reach the warlord\'s camp and encourage him to use their sailing cart to travel to the feast.
